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20 Threads found on edaboard.com: Noise Cancelling
This is an echo cancelling system used in modems and other communication devices. Some have single echo cancel, better ones have two like this problem. This was the main reason for old phone modem connection speed limits due to noise caused by echoes, not hiss or hum. Now the same is true with WiFi, similar in forward direction, we call it Ri
I am currently building an active noise cancelling headphone. However, there are some circuit design problems that I am not sure on my design. Basically, in my design, there is a mic capsule connecting a low pass filter pre-amp.Then the pre-amp is connecting to phase reverser, which can generate the reversed phase. Howe
I am trying to develop a noise cancelling circuit for personal use with existing headphones. I have obtained as3430 IC for this purpose, but i have not been able to find some of the key values to completely develop the circuit. Please, refer to the attached image. Data sheet for the IC is available here
Hello, I am building a simple laser or led communicator with LM386 and photodiode. I have tested the transmitter and receiver with success. The problem is that the photodiode receives fluorescent lights fluctuations as well. I was thinking of using two phododiodes in a noise canceling scheme like this
You have too many threads about your noisy printer room. In your first thread you were told that using sound absorbent material for walls, ceiling and floor will reduce the average sound level. Of course earplugs should be used by workers but I recommended noise cancelling headphones.
Hello, Folks, I am looking for a pair of Active noise Cancellation (ANC) headphones that could cancel human speaking. But almost all headphones in the market are just cancelling the low-frequency noises such as engine or fan. I do not understand why the higher-frequency parts of human voices could not be cancelled since ear hearing (...)
Hi there i am a final year student in electronics and i need help for my final year project which is implementation of an "active noise cancelling headphone" using FPGA. please contact me on if you can help me i need to submit the project in November 2012. help is needed urgently
Hi, You'll have no problems connecting it to a 386. It will be fine. It will work with any 2-pin electret element. It's not a hi-fi circuit (but a 386 really isn't hi-fi either), but certainly noise+distortion is reasonably low with this preamp - so you could upgrade from the 386 if you really wanted to.. Of course, there are better circuits (and
I am trying to design a circuit to reduce background noise inside a vehicle as its driving and stopped but generally with a lot of back-ground noise. As is the audio is full of background noise and it is very hard to hear people talking, I know there are some new IC's on the market that are supposed to assist in noise (...)
In noise cancelling mode, CPU is in sleep state for A/D conversion time - no HF noise generated. Interrupt wakes CPU from sleep state just after A/D conversion is finished. Variable "adc_data" is global and is probably declared elsewhere.
Hi, I am designing wide band lna and freq range is 0.7~2.7GHz am using noise cancelling technique, but gain is not flat. and linearity is poor in 0.7GHz than 2.7GHz. Is there possible to use shunt peaking inductor to get flat gain and how to improve linearity (I'm using CADENC for simulation)
I am going to design a project which will cancel the ambient noise. the device will capture the speaker's voice but eliminate all other noises from ambient such as high way, construction field, in airplane, etc.. I did some researches, the two microphones seems right direction. the first mic picks up speaker's voice, and second mi
Hi, I am designing wide band lna and freq range is 0.7~2.7GHz am using noise cancelling technique, but gain is not flat. and linearity is poor in 0.7GHz than 2.7GHz. Is there possible to use shunt peaking inductor to get flat gain and how to improve linearity (I'm using CADENC for simulation)
hi the differential pair routing will help in cancelling out noise impact. so, even if it is analog signal we can use differential pair. i.e., the reason why we usually route the inputs of an op-amp as differential pair. hope this info. helps Regards
Hello Everyone; What is the function of feed-thru capacitors in RF modules? noise cancelling? Please answer.
hi I'm currently working on a project for multi-channel speech enhancement techniques. I've decided to work on Microphone Array using Delay-and-Sum Beamforming technique follow-up by adaptive noise cancelling. I've chosen to used MATLAB for the simulation. I have read lots of stuffs on these things and I believe I know the important stuffs. Howe
Hi, For short distances of few meters, you can simply twist ordinary 7 strand insulated wires and use them without any termination resistors. Twisted pair helps in cancelling induced voltages and thus keeps the noise at bay. For longer than 20 meters, better to use commonly available CAT cables containing twisted wires, which are used for com
the whole system required for signal averaging in simple and easy to implement but noise cancellation methods are complex with adaptive filters and pll etc which is pretty tought to experiment.... but noise cancellation methods gives better performace and SNR is higher then Signal averaging hope it helped u -helios
please help me check the m-file about fuzzy logic using in noise cancelling. thanks! it exists some error: ans = 501.0015 ??? Index exceeds matrix dimensions. Error in ==> C:\MATLAB6p1\toolbox\fuzzy\fuzzy\genparam.m On line 80 ==> a = (range(i,2) - range(i, 1))/2/(mf_n(i) - 1); Error in ==> C:\MATLAB6p1\toolbox\fuzzy\f
The trick is in differential mode. The faster serial buses like USB, firewire, ethernet etc all use differential pairs for data. Differential mode offers a lot more noise rejection besides cancelling rise / fall time delays. If a parallel bus is designed with differential signal, it would be too expensive. But you can get very high data speeds.